Pump



Feb. 21, 1928. 1,660,304

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Feb. 21, 1928.

C. W. HERRIN PUMP 2 Shoots-Shoot 2 32 5 Filed D60. 18 1925 r gnocntoz C/zarZeJ 1K Kerr/z n,

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Patented Feb. 21, 1928.

UNITED STATES PATENT OFFICE.

CHARLES W. HEREIN, OF KANSAS CITY, MISSOURI, ASSIGNOR OF ONE-HALF '10' CLAYTON BELL, OF KANSAS CITY, MISSOURI.

PUMP.

Application filed December 18, 1925. Serial No. 76,249.

which may be manufactured and assembled at less cost, to provide a direct passage through the plunger rod to the pump barrel for the'flow of oil instead of requiring the same to pursue a more tortuous path from the plunger rod into the plunger head and thence into the pump barrel, and to dispense with the guide means 66 and 68 which direct the dogs 58 through the slots 56 for securing the plunger head to the plunger rod, as shown and described in said copending application.

In order that the invention may be fully understood, reference will now be had to the I accompanying drawings, in which:

Fi 1 shows a fragmentary vertical section of a well with the plunger head being slipped into position over the lower portion of the plunger rod preparatory to lowering the same into the pump barrel.

Fig. 2 shows the parts disclosed by Fig. 1, with the plunger head occupying its normal position upon the lower section of the plunger rod which is lowered to working posi tion in the pump barrel.

Fig. 3 is an enlarged detail vertical sectional view of the lower section of the plungor red. 1

Fig. i is an enlarged detail vertical sectional view of the plunger head and associate parts.

Fig. 5 is an assembled view of the lower section of the plunger rod and the plunger head with associated parts, the plunger rod section being in elevation and the plunger head and associated parts in vertical section.

6 is a cross section on line 66 of F ig. 5. v 1

Fig. 7 is a view similar to Fig. 5, with the lower portion broken away and the tubular clamp lowered to hold the dogs firmly in en- I gagement with the plunger rod.

Fig. 8 shows a fragmentary elevation of the tubular clamp with one of the slots therin for admission of one of the dogs.

Fig. 9 shows a fragmentary elevation of the plunger head sleeve with one of the dogs pivotally mounted therein.

Fig. 10 shows two detail perspective views of one ofthe dogs.

Referring now in detail to the different parts, A designates the usual well casing in which the pump barrel2 is arranged. The pump barrel 2 may be of any ordinary, or preferred construction and is provided at its iower end with the customaryfoot valve 4, through which the oil is admitted to the interior of the pump barrel 2. The upper end of the" pump barrel 2 is connected by a. cou-' pling 6 to tubing 8, which is supported at the upper end of the well in the usual manner.

1O designates the. plunger rod which may be actuated from the top of the well in the usual manner, as by a pumpjack not shown, and when in working position extends down into the lower portion of the pump barrel 2 as shown by Fig. 2. The lower section 12 of the plunger rod is of tubular form so that oil or other fluid may pass upwardly therethrou'gh on each downward stroke of the plunger rod and discharge through ports 14 of a cage 16 detachably connecting the section 12 with the superimposed section of said plunger rod.

,4 The cage 16 is equipped with a ball check valve 18, which opens on each downward stroke. for the discharge of oil through the ports 14 and closes on each upward stroke of the plunger rod and thereby prevents the oil which has been discharged through the ports li from flowing backwardly therethrough and-into the section 12. The lower portion of the section 12 is equipped with leather or other suitable packing rings 20, which are held in position by the truncated conical seat 22 of a fitting21 threaded upon the lower end of said section 12. The fitting 21 has ports 2st anda solid bottom portion 26, which latter may, in the event thatthe foot valve 4 becomes loose,be employed as a hammer in forcing said foot valve firmly down into the tapered lower end of the barrel 2 bymoving the plunger rod up and down and permitting said bottom 26 to impinge against the upper end of said foot valve.

28 designates a plunger head sleeve adapted to be slipped over the plungerrod and detachably connected thereto by one or more dogs 30, which are adapted to be forced the sleeve 28, and said dogs are arranged in longitudinal slots and 12 in the sleeve 28 and the lower portion of the "tubular clamp 32, respectively, and thus prevent the latter from rotating in the former" and carrying the slots &2 out of coincidence with the slots l-O.

The dogs 30 have narrow body portions 1 1 adapted to move freely in the slots 10 and 42, and relatively broad heads l6 which are free to move only in the wide portions of 'the slots 42. The heads 46 have ihclined lower portions 50 against which the beveled shoulders 52 at the lower edges of the wide por tions of the slots 42 Contact when the clamp I 32 is raised to the position disclosed by Fig.

L, and thus throw the dogs 30 out of ment with the section 12, that the plunger head, hereinafter more fully described, may

he removed from the well without removing the plunger rod, as is the usual custom.

The sleeve 28 has threaded in its upper end a tubular extension (54 having a beveled upper margin 56 for disengaging elevator dog's 150 from a peripheral collar 58 at the upper portion ofthe clamp 32, which is provided at its extreme upper end with a sec ond peripheral collar 60 for engagement by i the elevator dogs 1510, as will hereinafter appear. For convenience in assembling the sleeve 28 and the tubular clamp 32 said sleeve 28 is detachable from thejexten'sion 54 and said clamp 32 is made in detachable upl per and lower sections 62 and 6 1, respectively, threaded together as indicated at 66.

The elevator mechanism embodying the dogs 150 is preferably of the type disclosed copen'ding application filed July 6, 1925, Serial No. 41*,6'6'0.

The tubular clamp 32 is slidably mounted in the sleeve 28 andthe extension '54, in order that it may be lowered to lock thed'ogs 30' in the active positiondisclosed by Fig. or raised to freethe dogs as shown in 'Fig. 4. The upward IHOVQIDGIlhOflZllB clamp 32 in the sleeve 28 and the extension 5 1, is checked by the enlarged upper end of its lowersectron 64E contacting the lower end of said extension 54', while thed'ownward movement of saidgcl'amp 32 is checked by the upper ends 65 or the slots 42 contacting the upper ends or the dog bodies let.

l The lower reduced end of the sleeve 28 is threaded into the upp'er'end of a tubular fitting carrying a plurality'oi leather or other suitable packing "cups 7 2 heldapart by spacing elements 74, all of which are held in place by anut 7 6 threaded upon the lower end of said tubular member 70. The nut 7 6 the sleeve 28, the packing cups 72, the spacing elements 74, and said nut 7 6.

Springs secured at their lower ends to the sleeve28 and fitting within longitudinal grooves 82 at the inner sides of the dogs 30 serve to hold the latter outwardly in the position disclosed by Fig. .4, while the plunger head is being lowered overwtlie plunger rod and through the tubing 8. e

v The operation briefly stated, is as follows: Assuming that the packing cups 72 have become worn and no longer operate elficiently in sucking oil into the barrel2 throughfthe foot valve 4, the plunger rod 10 is liftedwith the plungerhead into the tubing 8 bythe usual plunger rodhoisting mechanism l'ocated at thetop. of the well. After the lower end of the plunger rod with the fitting 21 has been raised clear of the top or the barrel 2 as shown byFi'g. 1, the plunger rod hoisting mechanism is stopped so that the plunger rod will remain stationary. The elevator mechanism is then lowered to engage the dogs 150 with the underside of the collar 60, and then hoisted to the surface with the plunger head. As the elevatorinechanism starts upwardly it first raises, the

tubular clamp 32, causing the upper end ofthe lower section 64 to contact the'lower end of the sleeve extension 54, whereupon theentire plunger head is hoisted. As the tubular clamp 32 initially moves upwardly independently of the sleeve 28, the wide portions of the slots 48 are carri'edi'nto position to free the upper ends of the dogs 30, so that they may be fort-edoutwardly by the springs 80 from beneath the shoulder 36 of the plunger rod section 12. In the event,however, that the springs 80 should fail to force the dogs 30 outwardly as stated, saiddogs are positively forced "outwardlyby the beveled shoulders 52, which contact the beveled p'ortions50 of the dogs and force the latter outwardly before the upper end of the section 64 contacts the lower end ,ofthe extension 54. When the dogs30 are freed from thepl'unger rod section 12 as stated, the plunger head is free to be lifted to the surface independently of the pluiiger rod. j A

After the worn packing cups 7 2 have been replaced by others, the plunger head is lowcred over the plunger rod by' the elevator mechanism, the dogs 150 of which engage the underside of the collar .58, ,As the plungor head moves downwardlytheheadsdti ot the dogs 30 are held outwardly beneath the upper ends of slots 42 by the spr ngs 80, so that there will be no danger of the plunger head falling the wide portions l8 of the loo due to the clamp 32 moving down into-the sleeve 28 far enough to allow the dogs 150 to be prematurely released from the'plunger head by the beveled upper end 56 of the extension 54.

After the plunger head reaches the conical seat 22 on the plunger rod 10, the same is.

lowered with the plunger headinto working position in the pump barrel 2. As theplunger head enters the barrel 2, the friction of the cups 7 2 against the inner surface of said barrel will retard the downward movement of the plunger head sufficiently to permit the clamp 32 to move down somewhat faster than said plunger head until checked by shoulders 67 contacting the upper ends of the dogs 30. The wide portions 48 of the slots 42 are now presented to the heads 46 of the dogs 30, so that the same may be forced inwardly by the barrel 2 beneath the shoulder 36 of the plunger rod section 12. As the dogs30 are forced inwardly by the barrel 2, the clamp 32 moves downwardly until checked by the ends of the slots,

42 contacting the upper ends of the bodies 44 of the dogs 30, the heads 4 .6 of which are firmly forced by the shoulders 67 into engagement with the tapered portion 34; of the section 12, so that the plunger head will be firmly secured to said section 12 and move up and down therewith when the pump is in operation. Downward movement of the clamp 32, as stated, also permits the elevator dogs 150 to contact the beveled end 56 of the extension 54, which releases said dogs 150 from the collar 58, so that the elevator mechanism can be lifted to the surface.

From the foregoing description, it is apparent that I have provided mechanism whereby the plunger head may be removed from the well independently of the plunger rod, thereby saving the time and expense of pulling said plunger rod from the well, the expense of which increases with the depth of the well.

lVhile I have shown and described the preferred form of the invention, I reserve all rights to such changes and modifications thereof as properly fall within the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. In an apparatus of the character described,'a plunger rod having a tubular section with a lower turncated conicalportion, a plunger head arranged tobe slipped over said section and having an internal tapered portion to snugly fit around said truncated conical portion, and pivotal means for detachably securing said plunger head in position upon said plunger rod section so that the plunger head may be raised to the surface of a Well independently of the plunger rod.

head and arran ed to be forced b i the mm barrel into engagement with the plunger rod section, and annular clamp means con nected to the plunger head and adapted to engage over said dogs and secure the latter in engagement with the plunger rod section.

In an apparatus of the character described, a plunger rod, a tubular plunger head arranged to he slipped over said plunger rod, a dog associated with said plunger head and adapted to detachably secure the same to the plunger rod, and clamp means adapted to be slipped downwardly over said dog for securing the latter in active position.

4. In'an apparatus of the character described, a plunger rod, a plunger head adapted to be slipped over said plunger rod, a dog mounted on said plunger head and adapted to engage the plunger rod, and annular clamp means slidably associated with the plunger rod when said. clamp means is slid in one direction and releases the dog from the plunger rod when said clamp means is slid in a reverse direction;

6. In an apparatus of the character described, a plunger rod, a plunger head adapted to be slipped over said plunger rod, adog mounted within said plunger head and having a narrow body portion and a relatively wide head, and clamp means for detachably clamping said dog against the plunger rod and slidably mounted within the l plunger head, said clamp means having a slot with a wide portion to permit the head of the dog to engage or disengage the plunger rod, a narrow portion into which the body of the dog projects, andshoulders at the juncture of the wide and narrow por-' tions of said slot for disengaging the dog from the plunger rod when the clamp means 1s slid in a reverse direction to that in which it is slid to carry the Wide portion ofthe slot into coincidence with the head of the dog. z

7. In an apl'mratus of the character described, a plunger rod, 11 plunger head adapted to be slipped over saidplunger rod, :1 dog mounted Within said plunger head, spring means for holdingsaid dog outwardly so that it will be forced inwardly by the pump barrel when lowered into the san'ie, and clamp -1neans for chunping said dog against the plunger rod after said dog has been forced inwardly by the pump barrel.

8. In an apparatus of the character desaid rod, dbgs inoun'ted within shid plnnger head and adapted to engage the tapered portion ofthe plunger rod, and chnhp means slidzibly associated With eixid plunger head and adaipfied when sl'id in one direction to dam said dogs agaiinstthe plunger rod and wlxe'n Slid in h 'rev'eree direction to releaee 'snid dogs.

In tesfilneny whereof I a'flix my signature.

CHARLES WQ HEREI 

